AT89LP51RC2 Atmel Corporation, AT89LP51RC2 Datasheet - Page 44
AT89LP51RC2
Manufacturer Part Number
AT89LP51RC2
Description
Manufacturer
Atmel Corporation
Specifications of AT89LP51RC2
Flash (kbytes)
32 Kbytes
Max. Operating Frequency
20 MHz
Cpu
8051-1C
Max I/o Pins
42
Spi
1
Twi (i2c)
1
Uart
1
Adc Channels
7
Adc Resolution (bits)
10
Adc Speed (ksps)
153.8
Sram (kbytes)
1.375
Self Program Memory
API
Operating Voltage (vcc)
2.4 to 5.5
Timers
4
Isp
SPI/OCD/UART
Watchdog
Yes
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6.5
6.6
44
External Clock Source B (AT89LP51IC2)
Dual Oscillator Support (AT89LP51IC2)
AT89LP51RB2/RC2/IC2 Preliminary
Figure 6-5.
Note:
The external clock option of AT89LP51IC2 disables the oscillator amplifier B and allows XTAL1B
to be driven directly by an external clock source as shown in
unconnected or used as general purpose I/O P4.2.
Figure 6-6.
The AT89LP51IC2 has the ability to switch between two different selectable system clock
sources under software control as shown in
Several operating modes are available and programmable by software:
Selection of which oscillator drives the system clock is controlled by the CKS bit in CKSEL. In
order to switch to a different oscillator, that oscillator must be enabled with the OscAEn or Osc-
• OSCA can be a high frequency crystal, external clock or the internal 8 MHz oscillator
• OSCB can be a low frequency crystal, external clock or the internal 8 MHz oscillator
• Switch system clock source from OSCA to OSCB and vice-versa
• Power down OSCA or OSCB to reduce consumption
• Boot from a fast responding, less accurate oscillator and switch later to a more accurate but
slow to stabilize oscillator.
1. C1, C2 = 10–20 pF for Crystals
Crystal Oscillator B Connections
External Clock A Drive Configuration
= 10–20 pF for Ceramic Resonators
OSCILLA T OR
EXTERNAL
NC GPIO
C2
C1
SIGNAL
Figure 6-2 on page
XTAL2B
XTAL1B
XT AL2B (P4.2)
XT AL1B (P1.0)
GND
~10 pF
~10 pF
Rd
Figure
41.
6-6. XTAL2B may be left
3722A–MICRO–10/11
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